Experimental and theoretical cross sections for positron scattering from the pentane isomers

Luca Chiari, Antonio Zecca, Francisco Blanco, G Garcia, Michael Brunger

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    Isomerism is ubiquitous in chemistry, physics, and biology. In atomic and molecular physics, in particular, isomer effects are well known in electron-impact phenomena; however, very little is known for positron collisions. Here we report on a set of experimental and theoretical cross sections for low-energy positron scattering from the three structural isomers of pentane: normal-pentane, isopentane, and neopentane. Total cross sections for positron scattering from normal-pentane and isopentane were measured at the University of Trento at incident energies between 0.1 and 50 eV. Calculations of the total cross sections, integral cross sections for elastic scattering, positronium formation, and electronic excitations plus direct ionization, as well as elastic differential cross sections were computed for all three isomers between 1 and 1000 eV using the independent atom model with screening corrected additivity rule. No definitive evidence of a significant isomer effect in positron scattering from the pentane isomers appears to be present.

    Original languageEnglish
    Article number084301
    Pages (from-to)084301
    Number of pages9
    JournalJournal of Chemical Physics
    Volume144
    Issue number8
    DOIs
    Publication statusPublished - 2016

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